Пример работы с подсказками DaData на Google Apps Script

suggest-gas.js

function getNameByINN(inn) {
  var url = "https://suggestions.dadata.ru/suggestions/api/4_1/rs/suggest/party";
  var query = '{"query": "' + inn + '"}'

  var headers = {
    "Authorization": "Token ВАШ_API_КЛЮЧ"
  };

  var fetchArgs = {
    method: "POST",
    contentType: "application/json",
    payload: query,
    headers: headers,
    muteHttpExceptions: false
  };
  var response = JSON.parse(UrlFetchApp.fetch(url, fetchArgs));
  var party = response.suggestions[0].data;

  return {
    success: 1,
    name: party.name.short_with_opf,
    type: party.type,
    kpp: party.kpp
  };
}